1971562807842 has 16 divisors (see below), whose sum is σ = 3943366525632. Its totient is φ = 657147450960.

The previous prime is 1971562807801. The next prime is 1971562807853. The reversal of 1971562807842 is 2487082651791.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9931438 + ... + 10128009.

It is an arithmetic number, because the mean of its divisors is an integer number (246460407852).

Almost surely, 2^{1971562807842} is an apocalyptic number.

1971562807842 is an abundant number, since it is smaller than the sum of its proper divisors (1971803717790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1971562807842 is a wasteful number, since it uses less digits than its factorization.

1971562807842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20075833.

The product of its (nonzero) digits is 13547520, while the sum is 60.

The spelling of 1971562807842 in words is "one trillion, nine hundred seventy-one billion, five hundred sixty-two million, eight hundred seven thousand, eight hundred forty-two".